METHOD FOR MANUFACTURING MICROPOROUS FILM AND MICROPOROUS FILM
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United States of America Patent
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Feb 25, 2015
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Feb 26, 2015
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The present invention provides a method for producing a microporous film, including: preparing a resin composition containing polypropylene (PP) as a resin component and containing from 0.01 to 20 parts by weight of a chemically modified cellulose or chemically modified cellulose nanofiber per 100 parts by weight of the resin component and from 0.01 to 3 parts by weight of a β-crystal nucleating agent per 100 parts by weight of the resin component; melt-molding the resin composition into a film-like material in which the crystal phase of a polypropylene component in the resin composition is substantially a β-crystal phase, and subsequently stretching the film-like material at a temperature of 60 to 160° C., and provides a microporous film.
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